Embalagens ativas: síntese de filmes antimicrobianos à base de Polietileno de baixa densidade e zeólita A contendo prata
Active antimicrobial packagings are materials endowed with the ability to inhibit and eliminate microorganisms that deteriorate food. Considering the great importance of practices aimed at obtaining safer food, less waste and longer shelf life of these products, the present work had the objective...
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| Formato: | Dissertação |
| Idioma: | pt_BR |
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Brasil
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| Endereço do item: | https://repositorio.ufrn.br/jspui/handle/123456789/28406 |
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| Resumo: | Active antimicrobial packagings are materials endowed with the ability to inhibit and
eliminate microorganisms that deteriorate food. Considering the great importance of practices
aimed at obtaining safer food, less waste and longer shelf life of these products, the present
work had the objective of synthesizing low density Polyethylene and zeolite A composite films
substituted with different contents of silver for use as active packaging. 1%, 5% and 10% silver
were inserted by means of cation exchange in the structure of zeolite A. The starting materials
were characterized by X-ray powder diffractometer, scanning electron microscopy, thermal
gravimetric analysis and X-ray Fluorescence diffractometer. The silver insertion in the zeolite
did not change its structure. The antibacterial activity of the silver-substituted zeolite was
performed by the minimum inhibitory concentration using Escherichia coli as target bacterium.
The MIC of the zeolite with 1% silver and concentration of 0,05 mg zeolite/mL was not able to
inhibit the visible growth of the bacterium, however, with the increase of the concentration
there was total inhibition in the period of 24h. The contents of 5% and 10% showed MIC equal
to 0,05 mg of zeolite/mL. The LDPE films added with silver-substituted zeolite A were
synthesized by wet-casting. The zeolite mass content in the films ranged from 1% to 5% by
mass. The films did not show significant changes in the thermal degradation profiles with the
increase of the zeolita/Ag mass content present in the composite. The films with best
antibacterial activity against Escherichia coli and Staphylococcus aureus were those prepared
with 5% and 10% silver substituted zeolite and with a mass content of 5% (w/w), showing great
potencial for applications such as active packaging in food preservation. |
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